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Superconductive digital instantaneous frequency-measurement subsystem

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6 Author(s)
G. -C. Liang ; Conductus Inc., Sunnyvale, CA, USA ; C. F. Shih ; R. S. Withers ; B. F. Cole
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A 5-b high-temperature-superconductive digital instantaneous frequency-measurement (DIFM) subsystem has been constructed for the determination of the frequency of unknown signals over a 500-MHz bandwidth, centered on 4 GHz, with a resolution of +or-7.8 MHz. The subsystem contains a cryogenic section with five discriminator modules using superconductive delay lines, GaAs mixers, and power dividers. The subsystem also has a room-temperature GaAs limiting amplifier and a silicon postprocessor. With a single-tone CW (continuous-wave) input between-40 dBm and +10 dBm, the frequency quantization boundaries of the subsystem are, on average, 3.1 MHz from their design values.<>

Published in:

Microwave Symposium Digest, 1993., IEEE MTT-S International

Date of Conference:

14-18 June 1993